20231116_Engineering_Calculations

Engineering Calculations
• Culvert Calculations
• Culvert Rip Rap Calculations
• Erosion Control Basin Design Calculations

A Ma--tin
NCECSM#6.61-SKIMMER SEDIMENT BASIN CALCULATIONS
Riser and Barrel
DATE Onoher 26,2a23
rcv 3-2019
BASIN M Skimmer 1/2 TOTAL DRAINAGE AREA M BASIN 19.30 AC Over 10 AC
TOTAL DISTURBED AREA TO BASIN t9,10 AC
Te 12 Minutes INTFNSITY(Irs) S.6
C 1 03 Weighted INTENSITY(ly) G4S
INTENSITY(It) 3.92
Q7r- CIA- 03 1. 16.45 11910 3696 1cfs
QrU- CIA- D3 x 1560 1. 11910 3209. Ica
Qt' C[ANNJ 03 Ix 1392 Ix 119to 1 12246 jar.
MINIMUM VOLUME REQUIRED 19.10 z 1 80 I 343s0.CF
SURFACE AREA REQUIRED Qts 32.09 1 x 1 "5 1 1 13,958'SF
BASIN STORAGE DIMENSIONS L W at volume sce.volume
BattomM591D
12,250 0 D o
StaraLf 17,350 5 74,500 74,500
Spillway 18.7p6 6 18.128 92.628Tap2 21,11q 8 39,820 132,448
'Inside dopes Q 2:1 678
DEPTH OF STORAGE 5 a
ROCK BAFFLE VOLUME REDUCTION ')'r Cu.Ft.
Dimensions Tap Width 2',Bottom Width a' " Volume Cu.Ft.
Height Y(I 1 side slopes)
Length Basin Slarage Width
STORAGE VOLUME PROVIDED 91 5 CF
SPILLWAY HEIGHT 6
TOP OF DAM IIEIGHT- 8
SPILLWAY-L-(%Oa1(3xIN") 11 ft Use Minimum of2lr
Spillway Flaw Depth(fl)- i
Faireloth Skimmer Specifications
Volume of Basin to Dewua(CF) 71 575
Drawdown(days) Volume(CF)
Skimmer Pipe Diameter 5' 2 65,644
Slimmer Orifice Diameter 4. 3 98.4%
Principle Spillway Calculations
Principle Spillway Capacity 2-yr Peak Flow per State Standard 6 61
Principle Spillway Size(Riser) L W Wier Flaw Length
Minimum Spillway Capacity(2-yr Peak Flow) 5 1 5 joax 16 5 Heighl of Box
Height from Tap of Riser to Emergency Spillway
1 It
Actual Riser Design Capacity(dz) 48 00 Qr 225 OK
BA1'IYt Site Calculations Diameter
IS"Minimum fl
641 efs Band Capacity 63.6 OK
Approximate Barrel Len q0
Buoyancy Calculations
Upward Fora Riser Area It Itiscr Height x Weight of Water per Cu.FL(62.4) $580 0
Downward Forte Weight of the concrete box less nude hole(00 Iblcl) 93153
Ballast Dimatsions Depth x Len x Width z Wdghl of Concrete per Cu.Ft.(150) 18750
Length Width Depth(R) Aren(eofl)
(R) (fl)
5.0 5.0 1 OS 1 12.5 I Total Weight 10190.3 OK

Martin
8701 Red Oak Blvd-Charlotte NC,28217
704-41W-147S
Culvert A Sizing Calculations
Date October 26,2023
Drainage Area Runoff 28 Year Proposed Required Provided Pipe Outlet Velocity
structure (acres) Coeificlent Intensity on Pipe Slope Pipe Size size (fps)
Culvert#2 95 0.3 0.45 183825 1000 13.98 f 8 8
Culvert A Rip Rap Apron Sizing Calculations
NC Sediment and Erosion Control Manual NYDOT Method (Appendix 8.06.5)
Outlet -1 p Rap Wnlmurn MYnTmum
Structure Pipe Size in Velocity Zone Stone Size ft Width ft
Culvert#2 18 8 1 1 T TT 6 45